. >> among the dead, 8-year-old martin richard, 29-year-old krystle campbell and the third victim is a boston university grad student from china whose parents asked her name not be made public. let's get to the latest with pete williams. i want to start with the two photos, the before and after of a bag next to a mailbox. how important are investigators thinking these could be? >> to be determined, i think. they are looking at this picture and similar pictures to see if that's how the bombs were placed. they're sort of contradictory photo evidence here about whether that's where they went because the after doesn't seem to show a lot of damage, but it's quite clear that the bombs themselves were not busted up into little tiny pieces and the pictures we're seeing show some large pictures of the cook er themselves. let me show you right here, you can see the brand name. inok. of one of the pressure cookers and on the pictures that show the batteries, this is a chinese made battery and these are also wires that were made in china. now, that kind of lead is very important because what the